Resolve "Add endpoint support for archiving/unarchiving groups"

Jonathan Bowerequested to merge
gitlab-community/gitlab-org/api/client-go:2241-group-archive_unarchive into main

Adds support for the following API endpoints:

  • groups/:i/archive
  • groups/:i/unarchive

This includes testing for the new methods. Closes #2241 (closed)

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